Graphical user interface for a portion of a display screen



The FIGURE is a front view of a new graphical user interface for a portion of a display screen showing our new design.

The outer border of the screen shown in broken line forms no part of the claimed design. All text and indicia located on the black areas of the graphical user interface for a portion of a display screen, with the exception of the two vertical gray stripes, are shown in broken line and form no part of the claimed design. All text and indicia located on the horizontal gray header of the graphical user interface for a portion of a display screen are shown in broken line and form no part of the claimed design. 

The ornamental design for a graphical user interface for a portion of a display screen, as shown and described. 